/**   
* @Title: CaptchaGernerator.java 
* @Package com.leesche.zcsp.node.utils.web 
* @Description:() 
* @author dennies yang
* @date 2016年9月23日 下午2:36:18 
* @version V1.0   
*/
package com.leesche.zcsp.node.utils.web.gernerator;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;

/**   
* @Title: CaptchaGernerator.java 
* @Package com.leesche.zcsp.node.utils.web 
* @Description:(图片) 
* @author dennies yang
* @date 2016年9月23日 下午2:36:18 
* @version V1.0   
*/
public class CaptchaGernerator {
	
	/**
	 * @throws IOException *
	 * 
	* @Title: ImageGernerator 
	* @Description: TODO(图片验证码生成) 
	* @param @param out   
	* @return void   
	* @throws
	 */
	public static  String ImageGernerator(OutputStream out) throws IOException{
		 String validCode="";
		 int width = 63;
	     int height = 37;
	     Random random = new Random();
		 BufferedImage image = new BufferedImage(width, height, 1);
	        //产生image类的Graphics用于绘制操作
	        Graphics g = image.getGraphics();
	        //Graphics类的样式
	        g.setColor(getRandColor(200, 250));
	        g.setFont(new Font("Times New Roman",0,28));
	        g.fillRect(0, 0, width, height);
	        //绘制干扰线
	        for(int i=0;i<40;i++){
	            g.setColor(getRandColor(130, 200));
	            int x = random.nextInt(width);
	            int y = random.nextInt(height);
	            int x1 = random.nextInt(12);
	            int y1 = random.nextInt(12);
	            g.drawLine(x, y, x + x1, y + y1);
	        }

	        //绘制字符
	        for(int i=0;i<4;i++){
	            String rand = String.valueOf(random.nextInt(10));
	            validCode = validCode + rand;
	            g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));
	            g.drawString(rand, 13*i+6, 28);
	        }
	        //将字符保存到session中用于前端的验证
	        g.dispose();

	        ImageIO.write(image, "JPEG", out);
	        out.flush();
			out.close();
		return validCode;
	}

	/**
	 * 
	* @Title: getRandColor 
	* @Description: TODO(创建颜色) 
	* @param @param fc
	* @param @param bc
	* @param @return   
	* @return Color   
	* @throws
	 */
   private static  Color getRandColor(int fc,int bc){
        Random random = new Random();
        if(fc>255)
            fc = 255;
        if(bc>255)
            bc = 255;
        int r = fc + random.nextInt(bc - fc);
        int g = fc + random.nextInt(bc - fc);
        int b = fc + random.nextInt(bc - fc);
        return new Color(r,g,b);
    }

}
